Ribbon spool



Aug. 7, 192a 1,679,713 J. S. DUNCAN ET AL RIBBON SPOOL Filed Aug. 26, 1925 UNITED STAT of Fig. 1.

Patented Aug. 7, 192 8.

E OFFICE..-

JOSEPH S. DUNCAN AND HENRY E. HUBBARD, OF CHICAGO, ILLINOIS, ASSIGNOBS, BY ZMESNE ASSIGNMENTS, TO ADDRESSOGRA PH COMPANY,.OF CHICAGO, ILLINOIS, A

CORPORATION OF DELAWARE.

RIBBON SPOOL.

Application filed August 26, 1925. Serial' No. 52,505.

This invention relates to ink ribbon spools forprinting machines of thegeneral character referredto in U. S. Patent No. 1,506,:

889 and No. 1,506,890, patented September 2, 1924i, to J. S. Duncan, assignor.

I The objects of the invention are to provide a ribbon spool of simple construction, to simplify the manufacture thereof; to secure the end flanges in rigid position in a simple manner and to provide for securing the ribbon securely to the spool and utilizing the securing means as a drivingelement for the spool. H

In the accompanying drawings illustrating a selected embodiment of the invention,

Fig. 1 is a plan view of a spool with the ribbon attached thereto.

Fig. 2 is a sectional view on the line 22 Fig. 3 is a sectional view on the line 3-3 of Fig. 2.

Fig. l is a plan view of the blank from which the body of the spool is made.

Figs. 5, 6, 7 and 8 show the successive I operations of securing the overlapping margins of the blank upon the ribbon to permanently connect the ribbon to the spool.

Referring to the drawings, the spool body is preferably made of thin sheet metal, the body 9 being formed by bending a blank 10 to cylindrical shape with its marginal edges overlapping and secured together, upon the end of the ribbon 11. One side margin of the blank is cut away at the corners 12 and the intermediate margin 13 is provided with little prongs 14. This margin 13 is depressed, as shown in Figs. 5, 8, to underlap the opposite margin 15 of the blank so that when the cylindrical body is formed the prongs will be located underneath the overlapping margin 15 and adjacent the free edge of the margin 13 (Fig. 5). Then the end of the ribbon is inserted between the two margins. This is accomplished easily by folding over the end of the ribbon upon itself as shown at 16, in Fig. 6, inserting a tool 17 in the fold and pushing the fold into position between the overlapping margins 15, 13. Then the tool can be withdrawn without disturbing the ribbon because the ribbon will engage the prongs 14 and remain in its position between the margins. Then the margins are pressed together, as shown in Fig. 7, and openings 18 are punched through! the marginsand the interposed ribbon as shown at 18 in Fig. The two layers of metal formed by the outer margin 15 and the .inner margin 13 are punched inward to form the opening 18 and their inner edges 19 are thrownin opposite directions in a hook-like form, as clearly shown in Fig. 3. The punched out portion forming the hole consists of the two opposite dis osed projections having the en s 19, an the 'projections of the various openings are located in alignment lengthwise of the spool. These projections collectively form a driving element which isengaged with a driver for turning the spool in a ribbon mechanism, besides forming a lock to hold the spool in shape and the ribbon in place and connected therewith.

Openings 20 are stamped in the blank 10 adjacent the ends thereof and these openings are generally U-shaped, forming tongues 21 which are sprung outward slightly and shoulders 22 spaced a short distance from the ends of the tongues, and also projected outwardly. The end flanges in the form of disks 23 are thrust upon the ends of the body of the spool and forced over the tongues 20 into engagement with the shoulders 22 whereupon the tongues spring outward again to rigidly hold the flanges between themselves and the shoulders. This is a simple way for assembling the end flanges with the body of the spool and for securing the end flanges rigidly upon the spool.

Our invention provides a ribbon spool of simple construction, which can be easily made and assembled and to which the ribbon is securely fastened by means which also form a driving element for the spool. Changes in the details of construction may be made without departing from the spirit of the invention, and we reserve the right to make all such changes as fall within the scope of the following claims.

We claim:

- 1. An ink ribbon spool comprising a cylindrical body made of thin sheet metal'and having integral tongues and shoulders struck up therefrom, and end flanges embracing the body between said tongues and shoulders and secured thereby.

2. An ink ribbon spool comprising a cylindrical body made of thin sheet metal and having substantially U-shaped openings stamped therein and tongues and shoulders struck up therefrom, and end flanges embracing the spool between said tongues and shoulders and secured thereby.

3. An ink ribbon spool comprising a cylindrical body made of thin sheet metal, yielding tongues and oppositely disposed shoulders struck up from the body of the spool and spaced from each other, and end flanges embracing the body between the tongues and shoulders and secured thereby.

4. An ink ribbon spool comprising a cylindrical body made of thin sheet metal, a plurality of yielding tongues struck up from the body of the spool and inwardly and outwardly directed, a plurality of shoulders struck up from the body of the spool and spaced from said tongues, and end flanges embracing the body between the tongues and shoulders and secured thereby.

5. An ink ribbon spool formed from a blank of sheet metal having substantially U-shaped openings punched therefrom, the

inner edges of said openings forming stop shoulders, the metal between the two legs of the openings forming tongues, and end flanges carried by said spool abutting against said stop shoulders and heldagainst lateral displacement therefrom by said tongues. I

6. A blank for ink ribbon spools having Ushaped openings punched therein, the inner edges of said openings forming stop shoulders, and the metal bet-ween the two legs of the openings forming tongues.-

7 A blank for ink ribbon spools having an intermediate marginal lap portion, said marginal portion being provided with rib-- bon retaining prongs, therebeing U-shaped openings punched in said blank,'the inner edges of said openings forming stop shoulders, and the metal between the twolegs of the openings forming tongues.

JOSEPH S. DUNCAN. HENRY E. HUBBARD. 

